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NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

64°F

18°C

Humidity 65%
Wind Speed N 7 mph
Barometer 30.19 in (1022.0 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 20 May 12:53 pm CDT
Extended Forecast for

Waterloo IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 66. North wind around 8 mph.

    High: 66 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. Northeast wind 3 to 7 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 70. Northeast wind 6 to 8 mph.

    High: 70 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 56. East wind around 8 mph.

    Low: 56 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 1pm. High near 72. East wind 7 to 9 mph. Chance of precipitation is 90%.

    High: 72 °F

    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers before 1am. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 66. North wind around 8 mph.
Tonight
Mostly cloudy, with a low around 54. Northeast wind 3 to 7 mph.
Thursday
Partly sunny, with a high near 70. Northeast wind 6 to 8 mph.
Thursday Night
A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 56. East wind around 8 mph.
Friday
Showers, with thunderstorms also possible after 1pm. High near 72. East wind 7 to 9 mph. Chance of precipitation is 90%.
Friday Night
A 40 percent chance of showers before 1am. Mostly cloudy, with a low around 58.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 40%.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79.
Sunday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 30%.
Memorial Day
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Tuesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
1:26 pm CDT May 20, 2026
Forecast Valid:
1pm CDT May 20, 2026-6pm CDT May 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation